塁上

1. Origins, structure, and basic meaning

• Structure: 塁上(るいじょう) adds 上, indicating location, to 塁, a baseball base.
• Basic usage: It describes runners who are on base or their efforts to reach home.

2. Common pitfalls and similar expressions

• No particular base specified
  • 二人の走者が塁上に残っていた means that two runners remained on base. 塁上 alone does not specify which base each runner occupied.
• Describing a player
  • 塁上の選手 means a player on base. の links the location to the player being described.